Magnesium base alloy



Expansion and strengthened. Small amounts of boron atent'ed Fe. 27, 1945 was a or iCresap Moss, Salt Lake City, Utah, assignor to Chicago Developmenti Company. Chicago, n1- s a corporation of 1 r:

No Drag. Application June 26, 1942.. Serial No. 448,623

(oi. rs-rss) I 11 Qlaims.

erably from 3% to the nickel content prefer-.

ably being less than the of the m nganese.

The following exampmgfig five of alloys made in accordance with my ntion, it being understood that the full scope of my invention is not intended to be limited except as set forth the claims. Example Electrolytic manganese produced by methods known in the art and containing at least 99.9% manganese was reduced to a fine powder and heated with pure nickel and with pure redistilled molten magnesium at 900 degrees C. for several hours. The resulting alloy was chill cast and on analysis it showed a content of 93.9% magnesium. 2% nickel and 2.1% manganese. I have found it desirable to use a magnesia crucible to prevent contamination and to melt in an atmosphere of purified helium. The alloy was then heated to about 900 degrees F. and extruded as close to that temperature as possible. The mold was operated at about 450 degrees F. The'following table lists various of the properties of the extruded alloy:

. minim-1.83 gr./cm.

Resistivity-5 .7 X ohms/cm. Modulus-6.86 x 10 lbs. /sq. in.

z.=26.c i lat :to 300 6.- s=24.2 10- at3,0'to 100 c.

\ Other specific examples of alloys which are within the scope of the present invention me,

for example, the following:

Magnesium Nickel Manganese Percent In general, the alloys of the present casehave particularly desirable properties in the extruded state. They may be subjected to various heat treatments as. for example, quick cooling from about 1200 degrees Fa followed by reheating to about 480 degrees F., wherebythey are hardened or other elements may be added iorcertain purposes with advantage.

The alloys-have utility for aircraft construction as, for example, pistons, cylinder heads for engines, and the like. Some of them, due to their electrical resistance characteristics may be used for electrical conductors. They are especially useful where high tensile strength at elevated temperatures is desired.

This application is a continuation-in-part of my prior application, Serial No. 326,173, filed March 27, 1940.

What is claimed as new and desired to be protected by Letters Patent of the United States is:

1. Magnesium-base alloys containing from about 2% to about 10% manganese, from about 1% to about 10% nickel, balance substantially all magnesium.

2. Magnesium base alloys containing from about 2% to about 10% electrolytic manganese having a purity of at least 99.0%, from about 3%- to about 5% nickel,- balance substantially all magnesium. r

3. Magnesium-base alloys containing about 2% manganese, about 4% nickel, balance substan= tially all magnesium.

4. Magnesium-base alloys containing about 5% manganese, about 5% nickel, balance substantially all magnesium.

5. Extruded magnesium-base alloys containing from about 2% to about 10% high purity manganese, from about 1% to about 10% nickel, balance substantially all magnesium.

6. Extruded magnesium-base alloys containing r from about 2% to about 10% electrolytic manganese having a purity of at least 99.0%, from about 3% to about 5% nickel, balance substantially all magnesium.

'7. An alloy of magnesium, manganese and. nickel, the manganese being from about 5% to about 10%, and the nickel at least 1% but less than the manganese, balance substantiallyall magnesium :said alloy being unusually rigid iii extruded form.

8. Magnesium-base alloys containing from about 2% to about 10% electrolytic manganese of at least 99.9% purity, at least 1% nickel, the nickel being present in amounts less than the amount of the manganese, balance substantially all magnesium. J v

9. Extruded magnesiumqbase alloys containing 1 from about 4% to about 6% high purity manganese, from about'3% to about 5% nickel, balance substantially all magnesium.

10. Extruded magnesium-base alloys "containing about 2% manganese, about 4% nickel, balance substantially all magnesium.

11. Extruded magnesium-base alloys containing about ,5% high purity manganese, about 5% nickel, balance substantially all magnesium.

- CRESAP MOSS. 

